The OAuth2 PHP client code is awesome. It gives great examples on how to use OAuth 2 with Google APIs. The problem is that I only want to use OAuth 2 for authentication NOT for authorization. I've looked around in the API for something that just authenticates but I can't find the right class.

How do I configure the Google PHP client to only authenticate via OAuth?

I considered just authenticating the client (i.e. `$client->authenticate($_GET['token'])) but that's not ideal because the user is still asked to authorize access to different resources. I don't want to see their email, picture, etc. I just want Google to verify that they are who they say they are.